The reward for information leading to the return of Jayme Closs has been doubled to $50,000 as, 12 days after the 13-year-old disappeared and her parents were killed.

The teenager hasn't been seen since Monday, October 15 when her parents Denise, 46, and James, 56, were brutally gunned down in the family's home in Barron, Wisconsin.

Investigators are no closer to naming either a suspect or a motive and Barron County Sheriff's Department first offered a reward of $25,000 on Wednesday when two of Jaymes' aunts made an emotional plea for the girl's safe return.

Now Jennie O Turkey Factory where both Denise and James worked has contributed a further $25,000.

Still missing: The reward for details on Jayme Closs' whereabouts has doubled to $50,000. The 13-year-old vanished moments after her parents were gunned down last week

Now Jennie O Turkey Factory (pictured) where both Denise and James worked has contributed a further $25,000

Jennifer Smith and Suzy Allard - Denise Closs's sisters - thanked the public for their continued 'love and support' as they continue to hope for the safe return of their 'sweet Jayme'

The FBI is expanding its search nationwide after placing Jayme atop its Missing Persons list

Jennifer Smith and Suzy Allard - Denise Closs's sisters - thanked the public for their continued 'love and support' as they continue to hope for the safe return of their 'sweet Jayme.'

Speaking directly to her missing niece, Smith continued, 'Jayme, not a moment goes by when we aren't thinking of you and praying for you.

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Now in desperate bid to generate any new line of investigation he has appealed for anyone driving on Highway 8 on Monday 15 October between 12.30am and 1.30am to call the official tip line.

Asked if he had any specific reason for believing that Jayme is still alive he re-iterated the phrase he has used at every media briefing, 'We believe Jayme's out there, she's endangered and we need to bring a 13-year-old girl home.'

Anyone with information about Jayme's whereabouts is urged to call the Barron County Sheriff's Office at 1-855-744-3879, or contact their local FBI office

Investigators announced a $50,000 reward for any tips leading to her location